<template>
  <div class="channel-edit">
    <van-cell :border="false">
      <div slot="title" class="title-text">我的频道</div>
      <van-button class="edit-btn" size="mini" round type="danger" plain @click="isEdit=!isEdit">{{ isEdit?'完成' : '编辑'}}</van-button>
    </van-cell>
    <van-grid :gutter="10" class="my-grid">
      <van-grid-item
      
        class="grid-item"
        v-for="(channel,index) in myChannels"
        :key="index"
        @click="onMyChannelClick(channel,index)"
      >
        <van-icon v-show="isEdit && ! fiexdChannels.includes(channel.id)" slot="icon" name="clear"></van-icon>
        <span class="text" slot="text" :class="{active:index===activeIndex}">{{channel.name}}</span>
      </van-grid-item>
    </van-grid>
    <van-cell :border="false">
      <div slot="title" class="title-text">频道推荐</div>
    </van-cell>
    <van-grid :gutter="10" class="recomment-grid">
      <van-grid-item
        icon="plus"
        class="grid-item"
        v-for="channel in recommendChannele"
        :key="channel.id"
        :text="channel.name"
        @click="onAddChannel(channel)"
      />
    </van-grid>
  </div>
</template>

<script>
import { getAllChannels,addUserChannel ,deleteUserChannel } from "@/api/channel";
import {setItem} from '@/utils/storeage'
import { mapState } from 'vuex'

export default {
  name: "ChannelEdit",

  props: {
    myChannels: {
      type: Array,
      required: true
    },
    activeIndex: {
      type: Number,
      required: true
    }
  },
  data() {
    return {
      allChannels: [],
      isEdit:false , //控制编辑状态
      fiexdChannels:[0]
    };
  },
  created() {
    this.locaAllChannels();
  },
  methods: {
    async locaAllChannels() {
      try {
        const { data } = await getAllChannels();
        this.allChannels = data.data.channels;
      } catch (err) {
        console.log(err);
        this.$toast("获取所有频道数据失败");
      }
    },
    async onAddChannel(channel) {
      this.myChannels.push(channel)
      if(this.user){
        try{
          await addUserChannel({
            id:channel.id,  //频道id
            seq:this.myChannels.length  //序号
          })
        }catch(err){
          this.$toast('保存失败,请稍后再试')
        }
      }else{
        setItem('TOUTIAO_CHANNELS',this.myChannels)
      }
    },
    onMyChannelClick(channel,index){
      if(this.isEdit){
        if(this.fiexdChannels.includes(channel.id)){
          return
        }
        this.myChannels.splice(index,1)
        if(index <=this.activeIndex){
          this.$emit('update-artive',this.activeIndex - 1,true)
        }
        this.deleteUserChannel(channel)
      }else{
        this.$emit('update-artive',index,false)
      }
    },
    async deleteUserChannel(channel){

      try{
        if(this.user){
         
          await deleteUserChannel(channel.id)
        }else{
          setItem('TOUTIAO_CHANNELS',this.myChannels)
        }
      }catch(err){
        console.log(err)
        this.$toast('操作失败，请稍后重试')
      }
    }
  },
  computed: {
    recommendChannele() {
      return this.allChannels.filter(channel => {
        return !this.myChannels.find(myChannels => {
          return myChannels.id === channel.id;
        });
      });
    },
    ...mapState(['user']),
  }
};
</script>

<style scoped lang="less">
.channel-edit {
  padding: 85px 0;

  .title-text {
    font-size: 32px;
    color: #333;
  }

  .edit-btn {
    width: 104px;
    height: 48px;
    font-size: 26px;
    color: #f85959;
    border: 1px solid #f85959;
  }

  /deep/ .grid-item {
    width: 160px;
    height: 86px;
    .van-grid-item__content {
      white-space: nowrap;
      background-color: #f4f5f6;

      .van-grid-item__text,
      .text {
        font-size: 22px;
        color: #222;
        margin-top: 4px !important;
      }
      .active {
        color: red;
      }
      .van-grid-item__icon-wrapper{
        position: unset;
      }
    }
  }

  /deep/ .my-grid {
    .grid-item {
      .van-icon-clear {
        position: absolute;
        right: -10px;
        top: -10px;
        font-size: 30px;
        color: #cacaca;
        z-index: 2;
      }
    }
  }

  /deep/ .recomment-grid {
    .grid-item {
      width: 160px;
      height: 86px;
      .van-grid-item__content {
        flex-direction: row;

        .van-icon-plus {
          font-size: 22px;
          line-height: 22px;
          margin-right: 6px;
        }
      }
    }
  }
}
</style>